Guren No Yumiya is the opening theme for the first 13 episodes of the first season of Attack on Titan. The opening theme can send a chill down every fan's spine.
Unravel by TK talks about Ken Kaneki's struggle with his identity. The opening theme is in every episode of Tokyo Ghoul's first season.
This song, by Yoko Takahashi, sends a message that life offers so much more. It is the only opening theme for Neon Genesis Evangelion.
The WORLD by Nightmare talks about the evil and darkness in the world. It runs as the opening song for the first 19 episodes of Death Note.
The jazz instrumental, Tank by The Seatbelts, complements Cowboy Bebop's mystery theme. The rhythmic editing of sequences and the music make the anime unique.
Colors by FLOW talks about how people can change for the better and the worst. It is the opening theme for the first 12 episodes of Code Geass's first season.
The Hero by the JAM Project has themes of justice and fits the satirical theme of One-Punch Man. It is the only opening theme in One-Punch Man's first season.
Again by YUI is the first opening theme for Fullmetal Alchemist: Brotherhood. It shows Edward Elric's journey of self-development.
The Day by Porno Graffiti is the first opening theme song of My Hero Academia. It perfectly describes Deku's journey.